NEET Biology question

Which of the following correctly identifies why a small part of activated sludge, rather than all of it, is recycled back to the aeration tank?

(A)Only a small inoculum is needed to seed the aeration tank's microbial population; the rest is sent for anaerobic digestionCorrect
(B)Recycling all of it would stop biogas production entirely
(C)The remaining sludge has no further use and must be discarded
(D)Recycling all of it is cheaper than recycling only a part

Answer: (A)

Solution

Only a small part of activated sludge is needed as inoculum to seed the aeration tank with the required microbial population,

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Question ID VK-124466